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Old 07-03-2001, 01:39 PM   #1
pdlindor
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Question Rear sway bar questions

Hello all.

I've been reading a lot about upgrades, and I'm thinking about the rear sway bar in my MY02RS, but I have a few questions:

What exactly will this upgrade provide?

What does the installation involve?

Will the stock suspension support a 20mm rear sway bar?

Will this throw off the center of gravity towards the rear of the car?

Does this require that I upgrade my front sway bar as well?

Thanks much,
~Paul
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Old 07-03-2001, 01:59 PM   #2
Mauricio
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As far as I know, a rear "anti-sway" bar induces over-stear, because it puts more force on the outside rear causing it to break away sooner than with the stock bar. I am clueless about the installation itself, but I do know that you might not need a new front bar depending on how big a rear bar you buy and how you want to set up your car.

I think thats how it goes, anyone else care to comment?

BTW- you might have a better shot if you would have posted this in the suspension forum.

Mods-Can you help this gentleman and move his thread?
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Old 07-04-2001, 01:56 PM   #3
Seeing StaRS
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^^Good call fellas. I'm looking to find out about sway bars too and I think rally kid has got the right idea, does anyone else have any other thoughts?

Actually check out this link:

How Stuff Works.Com-Stabilizer Bars

Last edited by Seeing StaRS; 07-04-2001 at 01:59 PM.
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Old 07-04-2001, 02:01 PM   #4
iBlueVirus
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installation is pretty easy. if you go to your local dealer, they might even do it for you, but mostly pretty darn expensive. you could do it yourself. just go to the dealer and ask them for the shop manual. I think it's like $25 or something. it's very clean in explaination... good luck! recommand you to get endlinks and mounts later on also...
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Old 07-04-2001, 02:33 PM   #5
imprezadan
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You really shouldn't need any manualto change out a rear sway bar. It took me probably less than 10 minutes to do mine. Granted it was on a lift, with a borrowed air ratchet, but hand tools are just fine and it's very self-explanetory once you get in there! Sorry, I can't remember the bolt sizes or anything.
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Old 07-04-2001, 05:17 PM   #6
cRayZee
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installation is pretty easy on a sway bar. Takes only a few minutes. Basically take out the stock one, and replace with the new one. That's it.

I heard that the rear sway bar will reduce understeer by inducing more oversteer, and the front sway bar will influence the opposite of that. I don't think it does anything to the car's center of gravity, besides maybe a little added weight of the bar vs the smaller stock a bar.

But i think a rear sway bar is an excellent mod. You'll feel a world of difference. Car will feel a lot less unstable when you're goin on those curves
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Old 07-04-2001, 06:27 PM   #7
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I believe the stock rear sway bar is 13mm. I hear that the highest you should really go is 18mm with the stock suspension. Otherwise you can get TOO much oversteer and be unsafe. I bought the Whiteline Adj. bar that goes from 18mm-20mm-22mm and set it at 18. It is amazing. I got the adj. one so after I do some suspension work I could just go to a stiffer setting.

I hope this helps.



Tats.
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Old 07-04-2001, 08:38 PM   #8
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Great mod! It was one of the first things I did. Swapped out the rear for a Cusco 22mm bar and set it to maximum stiffness. I still have understeer but much less so and only a front LSD wil cure the rest of it. Install is a snap. I had to remove the passenger rear tire to get the old one off. That's about it. Just a few bolts. Have some one help you so they can push the bar while you put on the endlinks.
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Old 07-05-2001, 03:01 AM   #9
Kostamojen
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Hes talking about the 20mm bar thats on the WRX which you can buy through subaruparts.com (cause the 02 RS only has a 13mm bar) and there is NO reason why this wont fit the car, cause its the same suspension
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Old 07-05-2001, 05:17 AM   #10
duckie
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these two links should answer ur questions and more
http://www.i-club.com/modifications.htm
http://www.scoobymods.com/
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Old 07-05-2001, 09:11 AM   #11
pdlindor
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Thanks for all of your help. An OEM WRX 20mm anti-sway bar will be my next purchase!

~Paul
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Old 07-05-2001, 10:24 AM   #12
nhluhr
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to reinforce what rallykid said, the rear antisway bar will increase oversteer in your car. It also reduces body roll which makes the car feel more stable. Likewise, a stiffer front antisway bar will increase understeer and also reduce body roll.

But to get things straight, lets think about WHY sway bars change the over/understeer characteristics:

two wheels side by side going around a corner. The outside wheel is on a larger arc, thus is turning less sharply and is also generally on better pavement (more free of traction-robbing debris). A car with soft antisway bars will allow the car to roll to the outside, thus transferring more weight to that wheel. A sway bar limits the body roll by transferring force from the outside suspension to the inside by compressing the inside as well. Since less weight is transferred to that outside wheel, it has less traction. Remember, the friction a tire makes on the pavement is equal to the force applied (weight) * area (contact patch, which grows with weight) * coeff of friction (more or less constant). With less weight transfer, the force and area are both reduced, meaning there is less traction on that outside wheel. BUT! you now have more traction on the inside wheel. Only problem is, since it's on a tighter arc and likely on a lesser surface (dust on side of road, perhaps), you get less overall traction, thus causing that set of wheels to slide. If the rear slides, you get oversteer. If the front slider, you get understeer.

Cheers!
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Old 07-05-2001, 11:20 AM   #13
ylexot
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Paul,
Just a couple notes since I have been doing some research and am in the process of getting a new rear bar myself. Rear bars from the old imprezas will fit on the new age Impreza, but there is less clearance for the exhaust which could be a factor if you want to change exhausts. I have heard that WRX front bars will NOT work on the RS. This is unconfirmed, but supposedly it has something to do with the engine mounting braces.

I am getting a Whiteline adjustable rear bar (made for the WRX) so that I can adjust it for track conditions when I start racing the car.

Micah
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Old 07-05-2001, 11:28 AM   #14
Krelkor
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what do the seperate endlinks do
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Old 07-05-2001, 02:33 PM   #15
pdlindor
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so, i'm now re-evaluating this decision. i still think that the stock 13mm bar on my 02RS is too small, however, now i'm being told that some body roll is a good thing for traction.

so i have a new question, how much roll is too much? should i go 16mm or 18mm instead of the WRX 20mm?

ylexot, where can one buy the whiteline adjustable bars?

thanks again for all your responses,
~Paul
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Old 07-06-2001, 12:30 AM   #16
ylexot
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Krelkor - The end links are stronger replacements for the stock end links. They also have harder bushings. I've heard that the stocks are too weak for 20mm and higher. I'm not sure this is still true for the new age imprezas since the WRX comes with a 20mm bar. I might just have to slide under the car tomorrow and take a look at them. There are also aftermarket mounting brackets with harder bushings.

Paul - Don't know about how much is too much. Personally, I'm used to cars that oversteer and the stock configuration has a fair amount of understeer. Therefore, I want the heavy bar to give more oversteer. The best prices I've found for the Whitelines is at www.rallispec.com. They may even have some left at the sale price.

Micah
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